Treadle-stand for sewing-machines.



No. 796,622 PATBNTED AUG.8,1905.

E. B. ALLEN. TRBADLB STAND PoR SEWING MACHINES.

AIPLIUATION YILBD HAY 29; 1905.

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No. 796,622. PATENTED AUG. 8,190.5. E. B. ALLEN.

TREADLE STAND FOR SEWING MACHINES.

APPLIGATION FILED MAY 29, 1905. y

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B. B. ALLEN.

TREADLE STAND FOB. SEWING MACHINES.

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UNITED STATES PATENT OEEICE.

EDW'ARD B. ALLEN, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGERMANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented Aug. 8, 1905,

Application filed May 29, 1905. Serial No. 262,738.

To all 10h/0m t mfay concern.

Be it known that I, EDWARD B. ALLEN, a citizen of thc United States,residing at Elizabeth, in the county of Union and State of New Jersey,have invented certain new and useful Improvements in Treadle-Stands forSewing- Machines, of which the following is a speciiication, referencebeing had therein to the accompanying drawings.

This invention relates particularlv to devices for driving andcontrolling the operation of that class of buttonhole-stitching machinesof which the forward end carrying the stitch-forming and work-holdingdevices is presented to the operator and the means for actuating thesame driven bythe operator are applied at the rear end out of convenientreach of the operator.

The invention has for its object to provide a treadle-stand for suchclass of buttonholemachines in which a single controlling-lever may beactuated by the operator to open and close the work-holder, start thetreadle mechanism in the right direction, and establish operativerelation of the machine with the treadle mechanism by actuation of thestop-motion device with which the machine is preferably provided.

In its preferred form the treadle-stand is provid ed with a table orshelf upon which the buttonhole-machine head is secured crosswise andupon the under side of which is supported in suitable bearings arock-shaft provided at one end with a depending crank-arm, to which ispivotally connected a pawl-lever for temporary engagement with aratchet-wheel rigidly attached to the usual peripherally-groovedband-wheel of the treadle mechanism and having at its other end anangular controllinglever connected thereto by a transverse pivotal pin,with one arm extended upwardly through a suitable angular slot in thetable and provided with a handle and another laterally-extending armconnected at its outer end with the starting-rod of the stop-motiondevice by means of a suitable fiexible connection. The said rock-shaftis provided also with an upwardly-extending rigid arm having aroller-stud adapted to engage the cam-shaped tail of a rock levercarried by a suitable bracket beneath the table, whose other end issuitably connected with the tail of the workclamp lever for tilting thelatter to open and close the work-clamp.

The invention will be understood by reference to the drawings annexed,in which- Fig-ure 1 is a rear side view of a treadlestand carrying abuttonhole cutting and stitching machine head of the Singer type andembodying the present improvements, and Fig. 2 is a plan of the same.Fig. 3 is a detached elevation of thecontrolling-lever with itsconnections, showing' a portion of the table in transverse section. Fig.4 is a perspective View of the band-wheel and the controlling devicesfor the same and the buttonhole-machine. Eig. 5 is a partial sectionalelevation representing a portion of the controllinglever withl theadjacent part of the rock-shaft to which it is pivoted.

As represented in the drawings, the treadlestand comprises the standards1, with intermediate brace 2, in which is journaled the band-wheel shaft3, supporting the band-wheel 4 and provided with a pair of cranks 5,embraced by the upper ends of a pair of pitmen 6, pivotally connected atthe lower ends with pins 7, carried by the independent rocking frames,having the treadle-plates 8 and mounted upon the center screws 9,applied to the brace 2 in a well-known manner. The treadlestand isprovided with the usual table or platform 10, upon which is secured thebase 11 of a buttonhole cutting and stitching machine having thebed-plate 12 and bracket-arm 13, in which is journaled the main shaft,provided at the rear end with the fast and loose pulleys 14 and 15. Thebelt 16 from the bandwheelis extended upwardly through suitableapertures in the table 10 to the fast and loose pulleys of the machine,to which it is guided alternately by means of the belt-shifting inger17, carried by the vibrating stop-motion lever 18, which in practicecarries a spring-pressed plunger 18X, adapted to engage a peripheralnotch in the cam 19, yieldingly secured to the pulley 14---asillustrated, for instance, in my United States Patent No. 767 ,539,dated August 16, 1904. The lever 18 is provided with a rigid laterallyand forwardly extending arm 20, ,to which is pivotally connected theoperating-rod 21, passing downwardly through an aperture in thebed-plate and provided with a lateral notch 22, adapted to be engaged byone end of a spring-pressed latch-lever 23, which is tripped at the endof each buttonholestitching operation by well-known means to release therod 21, and thereby permit the lever 18, under the action of a suitablespring, to assume its initial position, with its plunger inengagement'with the cam 19 and the belt 16 shifted upon the loose pulley14 for stopping the machine.

As represented in my United States Patent No. 767,540, dated August 16,1904, the machine is provided with transverse and longitudinalslide-plates 24 and Q5, the latter of which constitutes the lower memberof a workholder whose upper member comprises the foot-piece 26, looselyattached by suitable means to the bifurcated forward portion 27 of aclamp-lever which is pivoted to a suitable bracket upon the lower clampmember and has a tail portion 28 slightly overhanging the base 11 of themachine.

Upon the under side of the table 10 is mounted in suitable bearings 29 arock-shaft 30, carrying at its forward end a fixed bracket-piece 31, towhich is pivoted, by means of a pin 32, the angular portion of abell-crank lever having a lateral arm 33 connected at its outer end bymeans of a suitable chain or Vcord 34, led upwardly'over the groovedguide-pulley 35 and under the similar' guide-pulley 36 to theoperating-rod 2 1 for controlling thestop-lever 18, the otherupwardly-extending arm 37 of the bell-crank lever being projectedthrough an L-shaped aperture 38 in the table and provided at its upperend with a handle 39, such lever being maintained yieldingly in normalrelation with its supporting rock-shaft by means of a spring 31X,interposed between one end of a recess formed therefor in thebracketpiece 31 and the arm 37 of the bell-crank lever. r1`he shape andposition of the aperture 38 are such as to permit the handle 39 to beshift-ed in a direction transversely of the rock-shaft 30 to communicateto the same a rocking motion for purposes which will presently appear orlongitudinally of such shaft in order to rock the bell-crank leverthereon for actuating the operating-rod 21 to start the machine.

The rock-shaft 30 is provided at its rearward end with a depending rigidarm40, to the lower end of which is pivoted, by means of the pivotalscrew-pin 41, the rearward end of a pawl-lever 42, carrying upon itslower edge, at the middle portion, the pawl 43 and having a spring 44for maintaining its forward portion normally resting upon a fixed pin45, projecting from one of the band-wheel hangers 46 to enable the pawl43 when the shaft 30 is suitably actuated to engage lthe peripheralteeth of a ratchet-wheel 47, rigidly secured to the band-wheel by meansof the fastening-screws 48. The free end of the pawl-lever 4Q isprovided with a lateral pin 49, which is adapted in the forward movementof such lever to engage the under side of a cam-piece 50, carried at theouter end of a swinging' pawl-lifting arm 51, pivoted, by means of thescrew 52, upon the hanger 46 and normally resting upon thesupporting-pin 45. As the pawl-lever moves to eXtreme forward positionits motion is arrested by the engagement of the pawl 43 with the pin 45and its piu 49 passes from beneath the cam-piece 50 and permits thelatter to drop into initial position, as indicated in Fig. 3, afterwhich the retraction of the pawl-lever by the rocking of the shaft 30causes its pin 49 to engage the upper side of the cam-piece and to bethereby lifted so as to raise the pawl 43 clear of the teeth of theratchet-wheel and to avoid the creation of the objectionable noiseusually produced by ratchet-and-pawl mechanism.

rlhe rock-shaft 30 is provided with an upwardly-projecting arm 53,having a bifurcated upper end carrying in practice a suitableantifriction-roller mounted upon a pin 54 and adapted to engage thecam-shaped lower edge of an enlargement 55, formed upon one end of arock-lever 56, mounted upon a pivotal pin 57, supported by a liXedbracket 58 upon the under side of the table 10 and having its oppositeend connected, by means'of a suitable chain or cord 59, with the tailportion Q8 of the clamp-lever of the buttonhole-machine. It will beobserved that the swinging of the arm 53 by the rocking of the shaft 30causes the outer end of the former to move along the inclined extremityof the cam-shaped enlargement 55 and to enter the rounded notch therein,which serves to yieldingly hold such arm in initial position, with thelever 56 tilted to maintain the clamp-lever raised for introduction ofthe material. r1`he rocking of the shaft in a reverse direction servesto disengage the lever 53 from the cam portion 55 and permits theclamp-lever to close under the action of its spring 6() in the usualmanner.

From the foregoing description it will be evident that the presentimprovement is not limited to association only with buttonhole or othermachines adapted to produce a group or succession of stitches ofpredetermined number in a particular pattern, as in a buttonhole ortack, as it is equally applicable to other machines provided withstop-motion devices and having work-holding devices, such as aspring-actuated presser-foot operating in convjunction with thework-plate and drop-feed mechanism in feeding the work in respect of thestitch-forming devices.

Having thus set forth the nature of my invention, what I claim hereinis- 1. The combination with a supportingstand, suitable treadle-aetuateddriving mechanism with which said stand vis provided, and asewing-machine mounted upon said stand and provided with a suitablework-holder and with a connection with said treadle mechanism, ofmechanism comprising a common operating-lever for opening and closingsaid work-clamp and for imparting to said treadle mechanism an initialstarting movement.

2. rlhe combination with a supportingstand, suitable treadle-actuateddriving mechanism with which said stand is provided, and asewing-machine mounted upon said stand and provided with a suitablework-holder and with a connection with said treadle mechanism includinga stop-motion device for rendering said connection alternately operativeand inoperative in driving said machine, of mechanism comprising acommon operatinglever for opening and closing said work-clamp, forimparting to said treadle mechanism an initial starting movement and foractuating said stop-motion device to bring into operative relation theconnection of said sewingmachine with the treadle mechanism.

3. The combination with a supportingstand, suitable treadle-actuateddriving mechanism with which said stand is provided, and asewing-machine mounted upon said stand and provided with a work-holderand with a connection with said treadle mechanism including astop-motion device for rendering said connection alternately operativeand inoperative in driving said machine, of a rock -shaft, ratchetmechanism applied to said treadle mechanism and connected with andactuated by said rock-shaft, means also connected with said rock-shaftfor opening and closing said work-clamp, an operating-lever connectedwith said rock-shaft for rocking the same for operating the ratchetconnection with the treadle mechanism and the work-clamp connection, anda connection intermediate said operating-lever and stop-motion deviceand u, adapted for actuation independently of said rock-shaft foroperating said stop-motion device.

4. The combination with a supportingstand, suitable treadle-actuateddriving mechanism with which said stand is provided, and asewing-machine mounted upon said stand and provided with a connectionwith said treadle mechanism including a stop-motion device for renderingsaid connection alternately operative and inoperative in driving saidmachine, of mechanism comprising a common operating-lever adapted to beactuated successively to first impart an initial movement to saidtreadle mechanism and to thereafter actuate said stop-motion device tobring into operiative relation the connection of said sewingmachine withthe treadle mechanism.

5. The combination with a supportingstand, suitable treadle-actuateddriving mechanism with which said stand is provided, and asewing-machine mounted upon said stand and provided with a suitablework-holder and with a connection with said treadle mechanism, ofmechanism comprisinga common operrating-lever for opening and closingsaid workclarnp and imparting to said treadle mechanism an initialstarting movement, and means for holding said operating-lever in initialposition with the work-clamp open.

6. The combination with a supportingstand, suitable treadle-actuateddriving mechanism including a band-wheel shaft mounted in said stand andcarrying a band-wheel and a connected ratchet-wheel, and asewing-machine mounted upon said stand and provided with an operativeconnection with said treadle mechanism, of a rock-shaft, an arm fixedupon said rock-shaft, a pawl-lever provided with a pawl adapted toengage said ratchet-wheel, a

swinging pawl-lifting lever mounted upon a fixed supporting-pin andadapted to be lifted by said pawl-lever in the forward operativemovement and to lift said pawl-lever in the return movement of thelatter to disengage it from the ratchet-wheel, and means for actuatingsaid rock-shaft.

7. The combination with a supportingstand, suitable treadle-actuateddriving mechanism including a band-wheel shaft mounted in said stand andcarrying a band-wheel and a connected ratchet-wheel, and asewing-machine mounted upon said stand and provided with an operativeconnection with said treadle mechanism including a stop-motion devicefor rendering said connection alternately operative and inoperative indriving said machine, of a rock-shaft, an arm iixed upon said rockshaft,a pawl-lever provided with a pawl adapted to engage said ratchet-wheel,a swinging' pawl-lifting lever mounted upon a fixed supporting-pin andadapted to be lifted by said pawl-lever in the forward operativemovement and to lift said pawl-lever in the return movement of thelatter to disengage it from the ratchet-wheel, an operatingleverpivotally mounted upon a tranverse pin carried by said rock-shaft, andadapted to swing both longitudinally and transversely of the latter, anda connection intermediate said operating-lever and said stop-motiondevice.

8. The combination with a supportingstand, suitable treadle-actuateddriving mechanism including a band-wheel shaft mounted in said stand andcarrying a band-wheel and a connected ratchet-wheel, and asewing-machine mounted upon said stand and provided with an operativeconnection with said treadle mechanism, of a rock-shaft, an arm fixedupon said rock-shaft, a pawl-lever provided with a pawl adapted toengage said ratchet-wheel, a swinging pawl-lifting lever mounted upon afixed supporting-pin and provided at its outer end with alaterally-projecting cam-piece, a supporting and guiding pin fornormally supporting and guiding the outer ends of said pawl-lever andpawl-lifting lever, a lateral pin upon the outer portion of saidpawl-lever and guided in its forward motion by its supporting-pin intoengagement with the lower edge of said cam-piece which it serves toraise from initial position and engaging in its return movement theupper operative edge of said cam-piece in the'initial position of thelatter to lift the pawl-lever and thereby raise the pawl from contactwith said ratchet-wheel, and means for actuating said rock-shaft.

9. The combination with a supportingstand, suitable treadle-actuateddriving mechanism including a band-wheel shaft mounted in said stand andcarrying a band-wheel and a connected ratchet-Wheel, and asewing-machine mounted upon said stand and provided with a work-holderincluding a tilting springpressed clamp-lever and with an operativeconnection with said treadle mechanism, of a rockshaft, an arm fixedupon said rock-shaft, a pawl-lever provided with a pawl adapted toengage said ratchet-wheel, a second arm fixed upon said rock-shaft, arock -lever mounted upon a xed fulcrum-pin and having at one end acam-head adapted for operative engagement with the second-named arm uponsaid rock-shaft, a connection intermediate said rock-lever and saidclamp-lever, and means for actuating said rock-shaft whereby a singlemovement of the same serves to impart an initial movement to saidband-wheel and to effect the closing of said work-clamp.

l0. The combination with a supportingstand, suitable treadle-actuateddriving mechanism including a band-wheel shaft mounted in said stand.and carrying a band-Wheel and a connected ratchet-wheel, and asewing-machine mounted upon said stand and provided with a work-holderincluding a tilting springpressed clamp-lever and with an operativer..

connection with said treadle mechanism, of a rock-shaft, an arm iixedupon said rock-shaft, a pawl-lever provided with a pawl adapted toengage said ratchet-wheel, a second arm fixed upon said rock-shaft, arock-lever mounted upon a fixed fulcrum-pin and having at one end acam-head formed with an inclined operative portion and an adjacent notchor recess which the outer end of the second-named arm upon saidrock-shaft is adapted to engage successively, a connection .intermediatesaid rock-lever and said clamp-lever, and means for actuating saidrock-shaft whereby a single movement of the same serves to impart aninitial movement to said band-wheel and to y effect the closing of saidWork-clamp.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EDWARD B. ALLEN.

Witnesses:

ALFRED C. DARLnvG,` H. A. KORNEMANN.

